Slash commands only work on first message in Claude Code Desktop

Description

Slash commands (both built-in and custom) only work on the first message in a conversation in Claude Code Desktop. Attempting to use any slash command in subsequent messages returns "Unknown slash command: [command]".

Steps to Reproduce

1. Open Claude Code Desktop
2. Start a new conversation
3. Type a slash command (e.g., /help) - works correctly
4. Send a regular message
5. Try any slash command again (e.g., /help) - fails with "Unknown slash command: help"

Expected Behavior

Slash commands should work throughout the entire conversation, not just on the first message.

Actual Behavior

Slash commands only function on the first message. All subsequent attempts return "Unknown slash command" errors.

Workaround

Using the CLI directly instead of the Desktop app allows slash commands to work normally.

Environment

• Application: Claude Code Desktop
• OS: macOS (Darwin 23.5.0)